donaldson



(No Model.)

D. H. DONALDSON.

SEWER TRAP. No. 399,978. Patented Mar. 19, 1889.

Witnesses.

N. Pnzns. Pmlsumegnpm. wam-gum D. c.

UNITED STATES ATENT FFIC.

DAVID H. DONALDSON, OF BUFFALO, NEW YORK, ASSIGNOR TO ll-IIMSELF j AND OLIVER G. DONALDSON, OF SAME PLACE.

SEWER-TRAP.

SPECIFICATION forming part of Letters Patent No. 399,978, dated March 19, 1:889.

Application iiled January 23, 1889. Serial No. 297,289. (No model.)

To @ZZ wlw/0711, t may concern:

Be it known that I, DAVID H. DONALDSON, a citizen of the United States, residing in Buffalo, in the county of Erie and State of New York, have invented certain new and useful Improvements in Sewer-Traps, of which the following is a specification.

The object of my invention s to produce an effective self -cleaning gas-tight sewer-trap; and it will be fully and clearly hereinafter described and claimed, reference being had to the accompanying drawings, in which- Figure 1 is a sectional elevation cutting through all except the outlet-pipe. Fig. 2 is a side elevation of the trap complete. Fig. 3 is a top plan view of the lower part of the trap, the top being removed. Fig. 4 is a bottom view of the valve.

In said drawings, 1 represents the lower portion or body of the trap. It is provided with an S-shaped outlet-pipe, 2, the vertical portion of which, 3, passes up through the center of the body 1 even with the top portion, 4. Around the top 4 is an annular recess, into which a packing-ring, 5, of rubber or other suitable elastic material, is placed, and the upper edge is provided with outwardlyprojecting lugs (i to receive the screws or bolts 1'., (see Fig. 2,) for holding the top on.

To one side of the body or lower case, 1, is rigidly secured the inlet-pipe 7, and just above the upper side is a spirally-arranged diaphragm, S. The object of the spiral diaphragm 8 is to give the waterarotatin g movement as it rises up to the mouth of the outletpipe, moving in the direction of the arrows a.. (Shown in Figs. 1 and 3.) This lower case or body, its inlet and outlet pipes, and diaphragm 8 are preferably made of cast-iron and may be all cast in one piece; but any other suitable material may be used.

The top case or cover, 9, is a hollow cylindrical case having lugs 10, corresponding in shape and position to the lugs 6 on the lower case. The rim 11,01l the lower edge, projects a little below the lugs 10, so as to set down on the packing-ring and thereby insure a gastight joint when the screws i are put in and screwed down close, as in Fig. 2, thereby holding the top case, 9, rigidly in position and gas-tight.

For small traps for sinks or other similar purposes the upper oase, 9, may be made of glass or transparent material; but for large traps cast-iron will answer a good purpose.

In Figs. 1 and 4, 13 represents a valve having a packing of elastic or yielding material, 14, on the under side, and a small tapering hole, l5, up through the center. This valve 13 is either made hollow, as shown,I or of solne material sufficiently light to iioat on water. The object of the packing 14 is to allow the Valve to iit gas-tight on the inside of the rim Li, (see Fig. 1,) and also on the top 16 of the outlet-pipe, so that when the valve is closed it will be gas-tight.

The operation of the trap is as follows: Water passing in down through the inlet-pipe 7 passes from the opening c into the lowercase, l, and then passes up and around the spiral diaphragm, and as it rises high enough it floats the valve 13 up, as shown by the dotted lines 17 in Fig. 1, and flows down through the outlet-pipe. The -water during this movement is rotating rapidly, as hereinbefore mentioned, thereby causing the dirt to be washed from the sides of the trap and to be drawn to the center when it passes down with the water through the outlet-pipe. let-pipe is not supplied with water enough to cause it to iiow, as above mentioned, the valve again drops to its seat, and any pressure of gas coming up through the outlet-pipe tends to hold it closer and gas-tight to its seat, and thereby prevents the gas from coming out, and the water which remains in the trap up to or about the line f g also acts as an additional means for sealing the joint and preventing the escape of gas. By this means I make a reliable gas-tight trap for sewer purposes, or for any purpose for which such a trap may be used.

I claim as my invention-- 1. In a sewer-trap, an upper and lowercase secured together gas-tight, in combination with a valve-seat surrounding the upper portion of the lower case, an outlet-pipe projecting up into the lower case and havinga valveseat at its upper end, an inlet-pipe having its opening in the lower part of the lower case, and a valve having a central opening through it, adapted to fit the valveseats and rise and IVhe-n the out- IOO fall with 'the rise and fall of'the Water in the trap, substantially as and for the purposes described.

2. A sewer-trap consisting of an upper and lower ease secured together gas-tight, the lower case having an outlet-pipe passing up inside substantially even with the top of the saune, and an inlet-pipe passing down into the lower side, in combination Wit-h a spiral diaphragm surrounding the outlet-pipe to cause e rotation of the Water as it passes in, and a valve having an opening through it, adapted to Hoa-t or rise up as the Water passes up into the trap and down through the outlet-pipe, and to drop again to its seat as the level of the Water falls below the Valve-seat, substantially as and for the purposes described.

DAVID H. DONALDSON.

Witnesses:

JAMES SANGSTER, ARTHUR J. SANGSTER. 

